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arXiv 2005.05004physics.app-phcond-mat.mtrl-sci
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在低温下用低损耗石英体声波谐振器探测石墨烯的声学损耗

Probing the acoustic losses of graphene with a low-loss quartz bulk-acoustic-wave resonator at cryogenic temperatures

Serge Galliou, Jérémy Bon, Philippe Abbé, Rémy Vicarini, Michael E. Tobar, Maxim Goryachev

备注：
New Fig. and Text improved
发表信息：
Materials Science and Engineering B 287 (2023) 116102
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AI总结：

本研究利用SC切型石英晶体的三个厚度本征模式，在液氦低温下探测粘附石墨烯单层的力学损耗，测得4 K下最佳损耗约8×10⁻⁴，结合表面散射、热机械与本征应力及力-频率理论，解释了应力与质量负载交织的实验结果。

摘要：

我们观测了沉积在石英晶体衬底上的剥离石墨烯单层的力学效应，该衬底被设计为可在液氦温度下工作的极低损耗体声波腔。这一观测通过检测所谓SC切型的三个厚度本征模式的泛音实现，因为这种晶体切向的所有三个模式——两个剪切模式和一个拉伸模式——都可以通过电学方式探测。根据品质因数测量结果，粘附性石墨烯单层在4 K下的力学损耗在最佳情况下约为8×10⁻⁴。因此，该损耗显著高于已报道的悬浮石墨烯膜的损耗，也高于以扭转模式工作的SiO₂/Si衬底上粘附层的损耗。事实上，结果表明表面散射由粗糙度劣化7倍所导致。此外，本文给出的力学损耗还被置于器件承受热机械应力的背景下，但热机械应力并非唯一存在的应力。其中一些应力可能是与石墨烯层沉积过程相关的本征应力。基于应用于对应力响应不同的三个厚度模式的力-频率理论，研究证明这种应力效应实际上与质量负载效应相互交织，二者共同解释了实验结果。

英文摘要：

We observe mechanical effects of an exfoliated graphene monolayer deposited on a quartz crystal substrate designed to operate as an extremely low-loss bulk-acoustic-wave cavity at liquid-helium temperature.This is achieved by sensing overtones of the three thickness eigen-modes of the so-called SC-cut, since all three modes, two shear mode and one extensional mode, can be electrically probed with such a crystal cut. From quality-factor measurements, the mechanical losses of the adhesive graphene monolayer are assessed to be about 8 x 10-4 at 4 K in the best case. They are therefore significantly greater than those already reported for suspended membranes but also for adherent layers on SiO2/Si substrates operating in torsional modes. In fact, results reveal that surface scattering occurs due to a roughness degradation of a factor 7. In addition, the mechanical losses presented here are also placed in the context of a device submitted to thermomechanical stresses, but which are not the only ones existing. Some of them could be intrinsic ones related to the deposition process of the graphene layer. Based on a force-frequency theory applied to the three thickness modes which react differently to stresses, it is demonstrated that this stress effect actually entangled with that of mass loading reconciles the experimental results.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

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